Exterior lantern



FIG. 1 is a front perspective view of an exterior lantern showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken line showings of the light bulb socket in FIG. 1 is for purposes of illustration only and forms no part of the claimed design. 

The ornamental design for an exterior lantern, as shown and described. 